The data owner is best qualified to classify systems and data in accordance with external requirements. The data owner is responsible for determining how data should be classified based on its sensitivity, value, and regulatory requirements. They have the authority to decide on classification levels such as public, confidential, or secret, and ensure compliance with external standards. Other roles, like data custodians or processors, support the implementation of data management, but the data owner has the final responsibility for classification.

A hybrid IaaS solution in a single-tenancy cloud is the best option for the company to meet the computing demand while complying with healthcare standards for virtualization and cloud computing. A hybrid IaaS solution allows the company to use both on-premises and cloud-based resources to scale up its capacity and performance. A single-tenancy cloud ensures that the company's data and applications are isolated from other customers and have dedicated resources and security controls.

For an organization transitioning its Wi-Fi to WPA2/WPA3 Enterprise with EAP-TLS, X.509 certificates are crucial. EAP-TLS (Extensible Authentication Protocol-Transport Layer Security) is a certificate- based authentication protocol, and for it to work, both the client and server must have valid X.509 certificates. This ensures that the mobile devices can authenticate themselves securely to the wireless network. Other options like IPSec configurations or TOTP tokens are not relevant in the context of EAP-TLS wireless authentication.